Speedup A Slow Computer:Step By Step Tutorial

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1:Stop all unused applications/startup-In the right side of the TaskBar appears a group of small icons, collectively named as the "system tray". Each of these icons represent a program that has been at least partially started or is running "in the background". Regardless of state, each causes a reduction of available memory and processing power, or resources. Closing, exiting or canceling any unused icon returns those resources to the system, and becomes available for use by the applications started specifically by the user.

-start menu
-type msconfig
-start up
-uncheck programs that are not needed for start up
just like download manager,yahoo,skype,and any other.

NOTE:DO NOT UNCHECK YOUR ANTI VIRUS AND PROGRAMS THAT ARE NEEDED FOR WINDOWS TO LOAD
search google for more informations.
(screenshot)

2:Turn off unneeded Desktop Features that try to make things look better.UNCHECK IT The fancy rounded window corners, the way the menus fade in and out, and the 3-D button styles on modern Desktops all require some computing power and can overwhelm older machines. To turn off these appearance only enhancements:
-control pannel->system->advanced system settings->advanced(settings)->customise your best settings
if you want a simple window just click the adjust for best performance.

FOR Windows 7:
-Click the Start button,
-then Control Panel, and then System and Security. When you see System, click on it and then Advanced system settings. From here you can make sure you're on the Advanced tab and click on Settings under Performance. Here, you can also choose Adjust for best performance or choose Custom if you'd like to compromise between fancy visuals and performance. On a side note, this menu can be accessed much quicker by right-clicking on Computer, from either the Desktop or Start menu, selecting Properties, and then Advanced system settings.

FOR Windows XP - right click on My Computer, and choose the Properties option, then choose the Advanced tab, and click the Settings button under the Performance section. In the Performance Options dialogue that comes up, go to the Visual Effects tab, and choose "Adjust for best performance". You can also try the "Custom" option, and turn on and off individual settings to see which ones will work without slowing your machine down.

FOR WINDOWS Vista - Click the Start button, then Control Panel, then choose System and Maintenance, then Performance Information and Tools. Click Adjust visual effects. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. Click the Visual Effects tab, and choose "Adjust for best performance". You can also try the "Custom" option, and turn on and off individual settings to see which ones will work without slowing your machine down.

3:Empty the Recycle Bin. Simply deleting files from the disk doesn't really delete them at all, rather they are moved to a temporary holding area on the hard drive for easy restoration. This area is called the Recycle Bin and is usually displayed on the Desktop. Review the contents before emptying. Once emptied, the space on the hard drive that the data occupied is made available for reuse and the restoration of files emptied from the recycle bin becomes extremely difficult. Note that this will only speed up your computer if the hard drive is nearly full.

4:Uninstall all applications that are no longer needed. use the CCleaner tool to un install it.download it from www.cnet.com then type CCleaner.
Go to Tools-select the program to be uninstalled-run uninstaller
ADDITIONAL: 1:click the cleaner->Run cleaner
2:Cick the registry->scan for issues->fix selected issues->no->no

5:Run "Error Checking" on all hard drives. Right-click a drive icon in "My Computer" and select "Properties" followed by "Tools". Choose "Error Checking" to let the utility scan the drive for damaged files that can contribute to slow drive access speeds. This process may take several minutes or more to complete.

6:Run "Defragment" on all hard drives. Choose "Defragment" to let the utility clean up fragmented files and consolidate free space on the drive. This should be done at least once per week, or more often if the PC is used heavily. This process may take anywhere from several minutes to an hour or more to complete depending on size of the drives and amount of unused capacity or free space.After completion the speed of hard drive read and write times may improve significantly.
you can use ashampoo win optimiser 9 just search it in google and download.its free 40 days trial.
DEFRAGMENT ALSO YOUR REGISTRY.!
see screenshot

7:Install anti-virus software and keep it current. Anti-virus AV software is an absolute must. There are many from which to choose at the software store, but there are free AV solutions that do a very good job, too. Three popular free AV solutions are Avast!, AVG, and Avira AntiVir.but i prefer you to use ESET smart security 5 its much updated and better performance for all viruses detection even web virus detection. All include regular "virus definition" file updates that allow the AV program to detect and protect from the latest virii being released. Note that while installing antivirus software actually slows down your computer, it does not slow it down as much as malware does.

8:Clean Up Primary Partition. Click "Start" type "cleanmgr" and press "Enter" key. Select your primary partition  Windows installed drive, in most cases C:/ drive and scan it for junk files. After few seconds, it will show a list of unnecessory files and simply select all these check boxes and start cleaning your drive.

this also can slowdown your computer
-NOT enough RAM
-NOT enough DISK SPACE

if you have this problem,you need to buy this hardwares.some of this can buy a cheap one :)
TAKE NOTE:computers dont have the same ram and hard disk's/VC.you have to ask the seller what ram/VC/HD is suitable for your BOARD or CPU.